Hard alloy and preparation method and application

Abstract

The invention discloses hard alloy. The hard alloy comprises 5-10wt% of cobalt, 0.5-1.5wt% of chromium carbide and the balance tungsten carbide, wherein tungsten carbide comprises non-flaky tungsten carbide grains and flaky crystal tungsten carbide, and flaky crystal tungsten carbide accounts for 18-40wt% of the total mass of the hard alloy. Since the hard alloy contains flaky crystal tungsten carbide in an appropriate quantity, adhesive wear resistance of the alloy can be remarkably improved, and applying the hard alloy to roll collars for stainless steel wire rolling can realize a 30% raiseof stainless steel wire rolling tonnage.

Description

Technical field [0001] The invention belongs to the technical field of hard alloys, and relates to a hard alloy and a preparation method and application thereof. Background technique [0002] Since the advent of high-speed wire rolling mills, cemented carbide roll rings have emerged, and have been continuously improved with the development of rolling technology. The hard alloy used for high-speed wire rolling is required to have good thermal conductivity, less hardness reduction at high temperatures, good heat fatigue resistance, good wear resistance and high strength. The cemented carbide roll ring is developed on the basis of cemented carbide tool materials. It is a kind of refractory metal compound (such as WC, TaC, TiC, NbC, etc.) as the matrix, and transition metal (such as Co, Fe) , Ni) is a binder phase, a cermet tool material prepared by powder metallurgy. The production process of cemented carbide roll ring is mainly to wet-grind and mix the raw materials according to ...

AI Technical Summary

Problems solved by technology

According to the material characteristics of stainless steel, there are mainly the following factors that affect its processing performance: (1) The phenomenon of bonding wear is serious. Since stainless steel contains high alloying elements, it is easy to bond during high temperature rolling (greater than 1000°C) On the surface of the cemented carbide groove, it diffuses with the bonding phase metal in the roll ring material. Due to the good plasticity and toughness of stainless steel, the bonding metal on the surface of the rolling groove is not easy to separate during the rolling process, resulting in the formation of larger Rolling resistance, serious adhesive wear occurs; (2) stainless steel has severe work hardening, large linear expansion coefficient, etc. These factors also accelerate the wear of the rolling groove

At present, when the commonly used cemented carbide roll rings are used for rolling stainless steel wire rods, the roll rings have poor anti-adhesive wear ability, low service life of the roll rings, and poor surface quality of the rolling groove after use.

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